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Anatomic correlates of normal and diseased adenoids in children
Insights
Obstructive adenoid hyperplasia in children is caused by enlarged adenoids, not a smaller nasopharynx. Surgical removal of adenoids significantly increases nasopharyngeal volume, resolving obstruction.
Area of Science:
- Pediatric Otolaryngology
- Respiratory Physiology
- Anatomy
Background:
- Obstructive adenoid hyperplasia is a common condition in children.
- Understanding the anatomical basis of nasal obstruction is crucial for effective treatment.
- Previous studies suggested a smaller nasopharynx contributes to obstruction.
Purpose of the Study:
- To investigate the in vivo anatomical relationships of adenoids in children.
- To determine if nasal obstruction is due to adenoid size or nasopharyngeal dimensions.
- To compare children with obstructive adenoid hyperplasia to those with chronic adenoid infection.
Main Methods:
- Direct, intraoperative measurements of palatal, nasopharyngeal, and oropharyngeal dimensions.
- Comparison of 94 children: 19 controls, 44 with obstructive adenoid hyperplasia (OAH), and 31 with chronic adenoid infection (CAI).
- Measurement of adenoid weight, volume, and nasopharyngeal volume before and after adenoidectomy.
Main Results:
- Adenoid weight and volume were significantly greater in the OAH group compared to the CAI group.
- Nasopharyngeal volume was smaller in the OAH group before adenoidectomy.
- Nasopharyngeal volume significantly increased after adenoidectomy for obstruction, indicating enlarged adenoids are the primary cause of nasal obstruction.
Conclusions:
- Nasal obstruction in children with adenoid hyperplasia is primarily due to an absolute increase in adenoid size.
- A relatively smaller nasopharynx is not the main cause of obstruction.
- Observed differences in palatal and oropharyngeal dimensions are not consistently associated with longstanding obstruction from adenoid hyperplasia.
Abstract:
In order to better understand the pathogenesis and sequelae of obstructive adenoid hyperplasia in children, the anatomic relationships of the adenoids to the hard and soft palates, oropharynx, and nasopharynx were studied in vivo in 94 children. Direct, intraoperative palatal, nasopharyngeal, and oropharyngeal measurements were performed in 19 children with normal, nondiseased adenoids (controls [C]) and compared to 75 children undergoing adenoidectomy for obstructive adenoid hyperplasia (OAH) (n = 44) or chronic adenoid infection (CAI) (n = 31). As expected, the weight and volume of the adenoids removed were significantly greater in the OAH vs. CAI group (P < .001). Before adenoidectomy, the volume of the nasopharynx was significantly smaller in the OAH group; however, nasopharyngeal volumes after adenoidectomy were quite similar in all three groups and ranged from 5.4 to 6.2 cc. Only the change in the volume of the nasopharynx after adenoidectomy for obstruction was significant (2.5 +/- 1.2 cc, P < .01). Differences in oropharyngeal and palatal dimensions were not associated with longstanding obstruction from adenoid hyperplasia. These data indicate that the nasal obstruction from adenoid hyperplasia is due to an absolute increase in adenoid size rather than a relatively smaller nasopharynx. Differences in palatal and oropharyngeal dimensions usually described and attributed to longstanding nasal obstruction could not be demonstrated in this study.
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